Circuit Theorems And Conversions MCQ Questions & Answers | Electrical Engineering

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11.
Conversions between delta-type and wye-type circuit arrangements are useful in certain specialized applications.

A. True

B. False

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12.
Find the Norton circuit, that is, I_IN and R_N, for the circuit given below.

A. 478 mA, 12.8 Ω

B. 750 mA, 12.8 Ω

C. 478 mA, 6.8 Ω

D. 750 mA, 6.8 Ω

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13.
Find the Thevenin equivalent (VTH and RTH) between terminals A and B of the circuit given below.

A. 4.16 V, 120 Ω

B. 41.6 V, 120 Ω

C. 4.16 V, 70 Ω

D. 41.67 V, 70 Ω

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14.
Referring to circuit given, if R1 is changed to a 68 Ω resistor, what will be the current through it?

A. 0.16 A

B. 0.24 A

C. 0.2 A

D. 0.04 A

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15.
A 120 Ω load is connected across an ideal voltage source with VS = 12 V. The voltage across the load is

A. 0 V

B. 12 V

C. 120 V

D. Cannot be determined

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16.
A 120 Ω load is connected across a voltage source with VS = 12 V and RS = 8 Ω. The voltage across the load is

A. 11.25 V

B. 0 V

C. 12 V

D. 1.13 V

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17.
A 12 V source has an internal resistance of 90 Ω. If a load resistance of 20 Ω is connected to the voltage source, the load power, PL, is

A. 2.38 mW

B. 2.38 W

C. 238 mW

D. 23.8 W

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18.
An 18 V source has an internal resistance of 70 Ω. If a load resistance of 33 Ω is connected to the voltage source, the load power, PL, is

A. 0 W

B. 1 W

C. 175 mW

D. 18 mW

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19.
Some circuits require more than one voltage or current source.

A. True

B. False

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20.
Referring to the given circuit, determine V_TH and R_TH if a 68 Ω resistor is connected in parallel across R2 and R3.

A. 3.3 V, 148 Ω

B. 330 mV, 148 Ω

C. 3.3 V, 68 Ω

D. 330 mV, 68 Ω

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